CN206399454U - A kind of Miniature optical fiber grating wavelength demodulating system - Google Patents
A kind of Miniature optical fiber grating wavelength demodulating system Download PDFInfo
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- CN206399454U CN206399454U CN201621423434.3U CN201621423434U CN206399454U CN 206399454 U CN206399454 U CN 206399454U CN 201621423434 U CN201621423434 U CN 201621423434U CN 206399454 U CN206399454 U CN 206399454U
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Abstract
The utility model provides a kind of Miniature optical fiber grating wavelength demodulating system, including demodulation board, demodulate board and be provided with light path module, demodulator circuit module, the X4 interfaces of PCI E 2.0 and optical fiber FC interfaces, described light path module includes tunable laser, tunable laser socket, coupler, etalon, beam splitter and FBG sensor input interface；The optical signal that tunable laser is exported is divided into two ways of optical signals, i.e. optical signal 1 and optical signal 2 by coupler；Optical signal 1 is input in etalon, so as to produce the comb δ function formula of standard, is recently entered in detector；Optical signal 2 is input to beam splitter, produces 1 road optical signal and is input in fiber-optic grating sensor, and the reflected light of sensor is finally entered in detector by beam splitter again.The system replaces the complexity and encapsulation volume of the combination of traditional laser and tunable optic filter, effectively reduction light path using tunable laser as light source.
Description
Technical field
The utility model belongs to fiber optic sensor technology field, mainly a kind of Miniature optical fiber grating wavelength demodulation system
System.
Background technology
Fiber-optic grating sensor is because its small volume, lightweight, corrosion-resistant, sensitivity are high, not by electromagnetic interference, cost
It is low, the advantages of be easily integrated, optical fiber temperature-depth chain, optical fiber temperature deep profile instrument, fibre optic hydrophone etc. have been applied to, in marine hydrology
The military, civilian fields such as monitoring, underwater sound monitoring and non-sound antisubmarine detection have broad application prospects.
Fiber-optic grating sensor is to utilize fiber grating reflected light wavelength with temperature, the characteristic of stress variation, realizes physics
The measurement of amount, thus fiber grating reflected light wavelength demodulation method be fiber grating sensing technology core technology, wavelength
Measurement precision determines the performance of sensor.
The optic fiber grating wavelength demodulating system generally used at present, it is many using case type encapsulation, and connect by network interface or USB
Mouth connection PC realizes operating function；Or (FBG) demodulator is encapsulated in industry control cabinet realizes integrated chassis.But above-mentioned use
Mode, the volume of (FBG) demodulator is all than larger, to carrying and using there is certain requirement.Cause a main original of above mentioned problem
Cause, is due to that the scanning wave band of traditional (FBG) demodulator is all relatively wider, so having certain requirement to volume, along with optics
The problems such as connection and encapsulation, causes (FBG) demodulator volume larger.But from the point of view of the situation of (FBG) demodulator in actual use, often
Job requirement can be met only in the range of 8-10nm for a certain use environment effective scanning wavelength.
So according to actual service condition, designing a Miniature optical fiber grating wavelength solution for meeting wavelength scanning range
Adjusting system, realizes on the premise of its Wavelength demodulation function is met and (FBG) demodulator is made the board of PC to use, with very big
Application value.
Utility model content
The purpose of this utility model is to overcome the shortcomings of that prior art is present, and provides a kind of Miniature optical fiber grating ripple
Long demodulating system, uses the tunable laser that wavelength scanning range is 10nm as light source, coordinates miniaturization etalon maximum
The reduction light path volume of limit；Using FPGA as core cell, laser drive control, synchronous scanning and collection, ripple are realized
Length demodulating algorithm, and PCI-E bus protocols are realized in FPGA, system, which is packaged into board, can be plugged on PC mainboard
On PCI-E slots, the function of access PC is realized.
The purpose of this utility model is completed by following technical solution.This Miniature optical fiber grating wavelength demodulation
System, including demodulation board, demodulation board are provided with light path module, demodulator circuit module, the X4 interfaces of PCI-E 2.0 and optical fiber
FC interfaces, described light path module include tunable laser, tunable laser socket, coupler, etalon, beam splitter and
FBG sensor input interface；The optical signal that tunable laser is exported is divided into two ways of optical signals, the i.e. He of optical signal 1 by coupler
Optical signal 2；Optical signal 1 is input in etalon, so as to produce the comb δ function formula of standard, is recently entered in detector；Light is believed
Numbers 2 are input to beam splitter, produce 1 road optical signal and are input in fiber-optic grating sensor, and the reflected light of sensor passes through beam splitting again
Device is finally entered in detector；Described demodulator circuit module includes main control unit FPGA, two-way A/D module, two-way and dynamically increased
Beneficial conditioning module, two-way photodetector module, laser drive control module, laser driving circuit and PCI-E interface mould
Block.
Meanwhile, in order to meet versatility, realize the scan function of C-band scope, system according to 1525nm-1534nm,
1535nm-1544nm, 1545nm-1554nm, 1555nm-1564nm wave-length coverage design 4 tunable laser, can basis
Actual use situation is changed.
Described photodetector module includes two photodetectors, and the optical signal that etalon input is connected all the way is made
On the basis of signal, another connection fiber-optic grating sensor input optical signal, after optical signal is exported via detector circuit
Produce；Dynamic gain conditioning module, the current signal that first detector is exported is converted to voltage signal, then is adjusted by dynamic gain
Signal amplitude is adjusted to the suitable degree of AD collections by reason module, and signal is filtered finally by multi-stage filter；Signal
The adjustment of amplitude carries out programme-control by main control unit FPGA, and the judgement for the signal amplitude come in by collection is come to multiplication factor
It is adjusted.
The beneficial effects of the utility model are：
A. the utility model uses the tunable laser with 10nm wavelength scanning ranges as light source, effectively reduces light
Road complexity and encapsulation volume, feasibility condition is provided for miniaturization, portable Wavelength demodulation system；
B. the utility model is carried out high-speed data by FPGA controls and adopted using key control units of the FPGA as system
Collection, laser drive control, inside realize that PCI-E interface agreement effectively reduces circuit peripheral equipment, and its speed is fast, flexibility is high
The features such as, to realize that the miniaturization function of system provides perfect solution；
C. the utility model uses PCI-E interface as external interface, pluggable on the mainboard of PC, realizes board work(
Can, Man Machine Interface high speed is convenient and swift, meanwhile, it is also pluggable in PCI-E cabinets, make special optic fibre grating wavelength solution
Instrument is adjusted to use；
D. the optic fiber grating wavelength demodulating system that the utility model is realized, can change 4 kinds of different wave length scanning ranges
Tunable laser, specific wave band is 1525nm-1534nm, 1535nm-1544nm, 1545nm-1554nm, 1555nm-
1564nm, can carry out free replacing, flexibility and versatility that increase system is used according to actual service condition；
E. the utility model carries out data acquisition using high sampling rate, gathers more on the premise of high scan frequency is kept
Point calculated so that refined resolution calibration, increase precision degree.
Brief description of the drawings
Fig. 1 is optic fiber grating wavelength demodulating system structured flowchart.
In figure：1 demodulation board, 2 light path modules, 3 demodulator circuit modules, wherein demodulation board includes：2 light path modules, 3 solutions
Adjust circuit module, the X4 interfaces of 16PCI-E 2.0,17 optical fiber FC interfaces；Light path module includes：4 tunable laser, 5 couplings
Device, 6 etalons, 7 beam splitters, 8FBG sensor inputs, 18 tunable laser bases；Demodulator circuit module includes：9 masters
Control unit F PGA, 10 photodetector modules, 11 dynamic gain conditioning modules, 12AD modules, 13 laser driving circuit, 14 are swashed
Light device drive control module, 15PCI-E interface modules.
Embodiment
Detailed introduction is done to the utility model below in conjunction with accompanying drawing：
In optic fiber grating wavelength demodulation board structure block diagram shown in Fig. 1, including demodulation board 1, demodulate board 1 and be provided with
Light path module 2, demodulator circuit module 3, the X4 interfaces 16 of PCI-E 2.0 and optical fiber FC interfaces 17.Board mainly includes circuit and light
Two, road part：Light path, which mainly realizes the output of tuned light c signal, be divided into two-way light, optical signal 2 joins as standard by etalon
Examine signal, optical signal 1 and FBG sensor is entered by beam splitter into sensor ends；Circuit part mainly realize two-way opto-electronic conversion,
Dynamic gain control, data acquisition, the output of laser driving control signal, status signal reception, Interface Controller and algorithm are realized
Etc. function.One optical fiber FC interface of periphery placement of board, for the connection of extraneous FBG sensor；In addition, being provided with a PCI-
The X4 interfaces of E 2.0 are used for grafting PCI-E bus apparatus.
Light path part：Described light path module 2 include tunable laser 4, tunable laser socket 18, coupler 5,
Etalon 6, beam splitter 7 and FBG sensor input interface 8.Described tunable laser 4 is as light source, provided with four kinds of differences
The laser of wave band, can send wavelength 1525nm-1534nm, 1535nm-1544nm, 1545nm-1554nm, 1555nm- respectively
Tetra- kinds of optical signals of 1564nm；The optical signal that tunable laser 4 is exported is divided into two ways of optical signals, the i.e. He of optical signal 1 by coupler 5
Optical signal 2；Optical signal 1 is input in etalon 6, so as to produce the comb δ function formula of standard, is recently entered in detector；Light is believed
Numbers 2 are input to beam splitter 7, produce 1 road optical signal and are input in fiber-optic grating sensor, and the reflected light of sensor passes through beam splitting again
Device 7 is finally entered in detector.
Circuit part：Described demodulator circuit module 3 includes main control unit FPGA9, two-way A/D module 12, two-way and dynamically increased
Beneficial conditioning module 11, two-way photodetector module 10, laser drive control module 14, laser driving circuit 13 and PCI-
E interface module 15.Described photodetector module 10 includes two photodetectors, connects what etalon 6 was inputted all the way
Optical signal is as reference signal, and the optical signal of another connection fiber-optic grating sensor input, optical signal is electric via detector
Produced after the output of road；Dynamic gain conditioning module 11, the current signal that first detector is exported is converted to voltage signal, then passes through
Signal amplitude is adjusted to the suitable degree of AD collections by dynamic gain conditioning module 11, and signal is entered finally by multi-stage filter
Row filtering；The adjustment of signal amplitude carries out programme-control by main control unit FPGA9, the judgement for the signal amplitude come in by collection
To be adjusted to multiplication factor；The signal of A/D module collection modulation module output, in order to subsequently realize high-precision algorithm, this
In be acquired using high sampling rate；Tunable laser drive control module includes constant current source module and TEC control modules.Its
In, constant current source module provides the current signal needed for light source output optical signal, and according to the optical signal of output different wave length, there is provided not
Realization is driven with current value；TEC control modules provide laser thermostatic control signal, according to the temperature of setting so that laser
Device keeps constant operating temperature, to ensure the stability of its work；Temperature control module mainly carries out thermostatic control to system, makes
It all keeps constant operating temperature under which kind of working environment, it is to avoid optical device causes system because of the change of temperature
Precision is affected.Thermostat module carries out programme-control by FPGA, the temperature value fed back according to thermistor, drives TEC
Temperature-compensating is carried out to reach the purpose of constant temperature；PCI-E interface module is realized as system and the connecting interface of control main frame
System command parameter inputs the function with data output, due to the high speed characteristics of PCI-E interface, it is possible to achieve initial data is real-time
Upload function, is easy to staff to debug, and the interface is realized by FPGA programmings；FPGA module is the core controller of system
Part, realizes data acquisition, dynamic gain control, laser drive signal output and dynamic adjustment, PCI-E interface control and wavelength
The functions such as demodulating algorithm.
The utility model minimizes the Wavelength demodulation of general sexual function in order to realize, light is used as using tunable laser
Source, effectively reduces light path volume；PCI-E interface agreement is realized in FPGA simultaneously, and there is provided system high-speed communication capacity；In addition,
The laser of four different wave lengths can be replaced, on the premise of portable, add the versatility of system.Wavelength demodulation is calculated
Method is realized by FPGA, is specifically included spectral peak and is sought position, three parts of spectral peak judgement and wavelength calculating.
1) required according to real work, select corresponding tunable laser, and assign on laser base；
2) show control host computer and corresponding parameter setting work is carried out according to the length scanning frequency range of selected laser；
3) FPGA controls drive module output modulated signal according to the parameter of setting, and modulated signal is exported with constant-current source again
Current signal be overlapped after, be input to tunable laser, it be driven；
4) tunable laser exports demodulation spectrum under the driving of drive signal, and enters coupler progress light splitting；
5) coupler is divided into two input light, and optical signal 1 is directly entered beam splitter, optical signal 2 and enters etalon；
6) etalon handles input signal, produces comb δ function formula strength signal and enters detector 0；
7) optical signal 1, which enters, is input to after beam splitter in the extraneous FBG sensor connected by FC interfaces, FBG sensor
The optical signal of reflection is entered in detector 1 by beam splitter again；
8) voltage signal of opto-electronic conversion output enters dynamic gain control module, and FPGA is adjusted according to the parameter of initial setting up
Whole gain factor is amplified, and amplification output signal is input to AD acquisition modules after low pass filter again；
9) FPGA receives data from A/D module, and judges whether its range value reaches the suitable ranges of AD, if being not up to or cutting
Ripple then controls dynamic gain control module to adjust accordingly, and the signal up to amplitude requirement does not do algorithm process；
10) FPGA resolves the data completed, passed through by carrying out Wavelength demodulation algorithm process to the valid data collected
PCI-E buses are uploaded to aobvious control end, meanwhile, show control end also can set various running parameters by PCI-E buses, also may be selected real
Shi Shangchuan initial data is used for the operation such as analysis；
11) when system works, FPGA controls pin by laser thermistor output pin and TEC, to laser
Carry out thermostatic control work, it is ensured that its stable working state.
It is understood that it will be understood by those skilled in the art that to the technical solution of the utility model and utility model structure
Think of is subject to equivalent substitution or changed all belong to the scope of the claims appended by the utility model.
Claims (3)
1. a kind of Miniature optical fiber grating wavelength demodulating system, it is characterised in that：Including demodulation board (1), demodulate on board (1)
Provided with light path module (2), demodulator circuit module (3), the X4 interfaces (16) of PCI-E 2.0 and optical fiber FC interfaces (17), described light
Road module (2) includes tunable laser (4), tunable laser socket (18), coupler (5), etalon (6), beam splitter
And FBG sensor input interface (8) (7)；The optical signal that tunable laser (4) is exported is divided into two-way light letter by coupler (5)
Number, i.e. optical signal 1 and optical signal 2；Optical signal 1 is input in etalon (6), so that the comb δ function formula of standard is produced, it is last defeated
Enter into detector；Optical signal 2 is input to beam splitter (7), produces 1 road optical signal and is input in fiber-optic grating sensor, senses
The reflected light of device is finally entered in detector by beam splitter (7) again；Described demodulator circuit module (3) includes main control unit
FPGA (9), two-way A/D module (12), two-way dynamic gain conditioning module (11), two-way photodetector module (10), laser
Drive control module (14), laser driving circuit (13) and PCI-E interface module (15).
2. Miniature optical fiber grating wavelength demodulating system according to claim 1, it is characterised in that：Described is tunable sharp
Light device (4) is as light source, and the laser provided with four kinds of different-wavebands can send wavelength 1525nm-1534nm, 1535nm- respectively
Tetra- kinds of optical signals of 1544nm, 1545nm-1554nm, 1555nm-1564nm.
3. Miniature optical fiber grating wavelength demodulating system according to claim 1, it is characterised in that：Described photodetection
Device module (10) includes two photodetectors, and the optical signal of etalon (6) input is connected all the way as reference signal, and in addition one
The optical signal of individual connection fiber-optic grating sensor input, optical signal is produced after being exported via detector circuit；Dynamic gain is nursed one's health
Module (11), first current signal that detector is exported be converted to voltage signal, then by dynamic gain conditioning module (11)
Signal amplitude is adjusted to the suitable degree of AD collections, and signal is filtered finally by multi-stage filter；The tune of signal amplitude
Whole to carry out programme-control by main control unit FPGA (9), the judgement for the signal amplitude come in by collection is come to multiplication factor progress
Adjustment.
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| CN201621423434.3U CN206399454U (en) | 2016-12-23 | 2016-12-23 | A kind of Miniature optical fiber grating wavelength demodulating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007483A (en) * | 2017-11-21 | 2018-05-08 | 北京航天控制仪器研究所 | A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function |
| CN110082068A (en) * | 2019-03-25 | 2019-08-02 | 中国船舶重工集团公司第七一五研究所 | A kind of optic fiber grating wavelength demodulating system and method with wavelength debugging functions |
-
2016
- 2016-12-23 CN CN201621423434.3U patent/CN206399454U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007483A (en) * | 2017-11-21 | 2018-05-08 | 北京航天控制仪器研究所 | A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function |
| CN110082068A (en) * | 2019-03-25 | 2019-08-02 | 中国船舶重工集团公司第七一五研究所 | A kind of optic fiber grating wavelength demodulating system and method with wavelength debugging functions |
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